Buy OEM 2005 Audi Part # 8R0411105CN (8R0-411-105-CN). Coil Spring. W/1 yellow, 1 gray, & 2 orange marks, w/1 yellow, 1 gray, & 2 orange marks. Suspension Coil Spring - Repair or Replace

Coil Spring.
Coil Spring.

Coil Spring

Fits Q5, SQ5

W/1 yellow, 1 gray, & 2 orange marks, w/1 yellow, 1 gray, & 2 orange marks.
Suspension Coil Spring - Repair or Replace
Your coil springs are not especially prone to failure, but if they have been cut, clamped, or heated to have the vehicle lowered, your 2005 Audi might benefit from replacing the strut springs. Excessive rust can make the springs more prone to failure. Contact your local Audi service department to have your suspension system evaluated.